<!DOCTYPE html>
<html>
<head>
<style>
div {
  position:relative;
  width:300px;
  height:200px;
  left:50px;
  top:50px;
}
.grandparentdiv {
  background:yellow;
  overflow:hidden;
}
.childdiv {
  background:green;
}
.grandchilddiv {
  background:red;
}
</style>
</head>
<body>
<div class="grandparentdiv">
  <div class="childdiv">
    <div class="grandchilddiv"></div>
  </div>
</div>
</body>
</html>

